Question

37. Would you have called her up had it been possible？ Yes, but I ________ busy doing my homework。

37. —— Would you have called her up had it been possible？
　　 Yes, but I ________ busy doing my homework.
　　 A. was B. were C. had been D. would be
选啥？为啥？

Answer 1

选A。因为问句是与过去事实相反的非真实条件句：Would you have called her up had it been possible?=If it had been possible,would you have called her up?; 答句：Yes,说明会的。但是后一句又有关键词：but,说明：but后不是虚拟语气，是当时的真实情况。所以选：A。

Answer 2

选A，问句是针对过去发生的事情的虚拟语气，但是回答则是对实际情况的陈述，不必使用虚拟,意思是当时我整忙着做作业（所以不可能），所以B不对，D从含义上不通。至于C，不能算错，但是不好，没有必要强调过去完成，一个过去进行就已经足够了。

Answer 3

a